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200 1 $aHuman behavior and the principle of least effort$ean introduction to human ecology$fD. George Kingsley-Zipf
210   $aCambridge$cAddison-Wesley$d1949
215   $axi, 573 p.$d23 cm
500 10$aHuman behavior and the principle of least effort$948156
610 1 $aEcologia umana
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700  1$aZipf,$bGeorge Kingsley$0449892
801  0$aIT$bUNIPARTHENOPE$c20090112$gRICA$2UNIMARC
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996   $aHuman behavior and the principle of least effort$948156
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